If you are going to play golf in NE Ohio, especially tournament golf you are going to play in the rain. There are two ways to cope with the rain, the denial method, and the acceptance method. The denial method, you deny the water access to your equipment, you are going to get wet no matter what, what is important is how you handle your clubs etc. The acceptance method, you want to get wet, you are prepared to handle wet clubs.
In order to deny access to water, you will need to have the following: A large umbrella, several gloves, if you wear them, and two towels.
The goal is to keep your grips as dry as possible, so, depending on whether you are walking, with a pull cart or riding and if the cart has a club shelter, you will use your umbrella to keep the top of your bag from getting wet, water running into your bag is your enemy. You will also place a dry towel and your spare gloves in the spokes of the umbrella frame. YOU MUST keep these dry, they are your safe haven.
Every couple of holes you will change gloves, the sooner the better wearing a dry glove matters, and the dry towel will help remove the water that will get on your grips, keeping this dry is your only thought, you will get wet, don’t try to keep yourself dry at the expense of your equipment.
If you go in the other direction, and accept that you and your equipment will get wet, all you really need is a good pair of rain gloves, they keep your hands attached to the club, no matter how wet you and they get. I prefer this method, less messing around and less distraction, all you need to do is your normal preshot routine, and hit it. The downside is you may lose some feel of the club, and definitely will find it harder to get to your tees and ballmarker.
Other things to consider is raingear, a good gore-tex jacket or rain-shirt will set you back a pretty penny, but is worth it if you are playing in cooler rainy weather, when it is hot, I have yet to find anything that will keep you dry without overheating, so a good moisture wicking shirt will serve, allowing the moisture to wick away quickly once it stops raining, or at least keeping its shape so you don’t look like a drenched rat in the clubhouse. Rain-pants especially if you ride are a must, and they are excellent when you are playing in cooler weather since they also work to keep the wind off of your legs. If you wear glasses a hat is a must, and one that keeps your head dry is great in cooler weather.
Most of us are not good enough to change our swings for wet weather, but if you can, attempt to sweep the ball of the turf, it will help prevent fat contact. Water on the greens will reduce the break, and will allow chips and pitches to skid, making distance control and issue. Of course if there is standing water on the green, you can move your ball to avoid it, since it is casual water, but if it is too bad why are you out there.
Also remember that water hazards are defined by their normal size, or stakes, water even though it is part of a pond, or creek, that is outside the normal banks or marker stakes is also casual water. And if your ball is not recoverable, you can drop another ball without penalty.
If you accept playing in the rain as a challenge, unique to golf, you can thrive when your opponents are falling apart, be a mudder, not a whiner.